Acoustic diaphragm.



w. .W. YOUNG. ACOUSTIC DIAPHRAGM.

APPLICATION FILED AUG. 1, 1911.

1,061,21 1. Patented May 6, 1913.

- WITNESSES; 'JNVENTORA r A TTORNEYS.

v hurrah STATES PATENT ormon.

wrnmnm .W. YOUNG, or neawnm, mnssncn'usnrrs, nssreiv'on, BY ,mnsivn Assisi:-

- manure, TO LUCY a. rooms, or neawm, mssacnusnrrs. w

aoous'r'rd prarnnaem.

' residing at A awam, in the county of gtate of Massachusetts, have- Hampden and invented a new and useful Acoustic Diaphragm, of which the following is a specification.

.member of the diaphragm in such a way that the necessary amount of vibration is M invention relates to improvements dia ragms having acoust1c..propert1es1 which are designed especially for the soundboxes oi talking mac ines, and consists essentially of what may be termed a'base member slit radially'and covered with a *permanentlyifixed integument on one or both sides, all as hereinafter set forth. The object of my invention is to produce a comparatively inexpensive diaphragm which is inherently durable retains its acoustic properties without deterioration for an-indefinite length of time, and ossess'es'such properties in so highly a deve oped state as to make the diaphragm superior for talking machine 'urposes. V

A furt er'object is to construct the base provided for-without unduly weakening diaphragm or taking from it the degreeik f stabilitywhich is also required in order'to obtain the.best results.

Other objects will appear in the course of the-following description.

I attain these objects y e means illus trated in; the accompanying drawings, in which- Fi ure l is a plan of a base member which may employed in my diaphra m; Fig'. 2-, a" similar view of a' slightly modified form of base member; Fig. 3, an enlarged central cross-section through a complete diaphragm which embodies my invention in a practical form, and, Fig. 4, a -similar cross-section through a diaphragmhaving integuments on both sides.

Similar figures refer to similar parts throughout the several views.

Diaphragms for the sound-boxes of talking machines .are made in the form of disks,

.for the-reason that better results are ob tained from round sound producing members of this-type, hence my diaphragm is .made round or disk-like.

Clhediaphragmcomprises a base member spectflcation of Letters Patent. Application and auu'n 1,1911. Serta1Ho.641,758. y i

' Patented May 6, 1913.

1 having one or more radial-slits 2 therein,

and a covering or integumentflon one'side' of such. base member, or two integuments l one oneach side of said member, such'm te ument or integuments being permanently.

.a xed to the base member by means of suitable adhesive and hardening material, as-

lacquer, varnish, shellac, and the like.

' For the base member 1 I provide a disk of. thin 'materiallwhich is resonant; and res silient and possesses the other-;;ne'cessary characteristics or qualitiesfor reproducing sound to-the. best advantage," such as alu minum fo'r'metal or a fine grade; of cardboard-for fiber, although I do not restrict -myself to these materials-inasmuch asl-the range of. iavailabl e materials for such base' member is quite wide, but merely mentionthem as examples of two: of the beit ma- I terials for my purpose.

In Fi 1 and-2, three' slits 2 are shown,

but, whi e. that numberismostpractical, for

some diaphragms,-for--others less thamthree or evenmore will be found advantageous,-

and. when only a single slit i s resent'm a diaphragmal base member the esi'red efiect may be produced. Each slit 2'radiates from the vicinity of the center of the base memtier 1 outward through the :edge of -such member, and when there are'three slits they are-preferably spaced uniformly. The slits such enlargements or perforations appearat 4, since by so doing the vibratory action of the base member and consequently of the diaphragm as a whole is still further increased, and this-without impairing the stability of said diaphragm.

For each inte'gument 3 a-thin fabric is e'mployed, the same being much thinner than -may be made without removing any of the material between the contiguous edges ofthe base member 1. In order to serve as a good absorbent medium forlthe adhesive mai terial, as is desired, the fabric .for the integument'S may be a paper of fairly loose texture. The integument becomes saturated with the'lacqueror other adhesive material .v only ofthe ase member "lis all that is necessaryto cover. the slits 2-, with their.fenl'arge-.

Q i i y 1,061,211

used,- when itwith such material is applied to the base member, and thus isfilled with the adhesive material when the" latter har-; dens, besides" being 'securely-fafiigtedato ;said-" base nie'n1ber.,-*Inthis way theinte guinent is closely and permanently united with the baseimember and enters so intimately into the structure of the diaphragm as toform with said member and the hardened a.d

hesive material a. disk or diaphragm which possesses ample strength and vibrations towhich s'uchra'device is subjectedv Ordinaril an integument 3 on one side mentsd when present, and bind together or connect, the slitted parts, as sliown in Fig. 3,

,i' eo I unduly with the flexibility of-said base member, but rather converting aufiabbiness which but-two integuments 3: may be employed, as issometimes desirable, as shown :m Fig. 4. Whether one or bothof the integumentsbef thejsaine in each case, such "otfice beingflto transform, with the aid of the adhesiVeLma Y teria'lfthe slitted base member into 'a'se'rvs Aceable diaphragm, vwhich":possesses all'gpf.

f the desired qualifications, byblosing or How ering the sl1ts 2 and connecting 'theparts separated by such slits without interfering the slitted member may have alone intozthe kind offlexibility or resiliency. required, and at the same time lending itself in other, ways,

such as those hereinbfore. ,pointed out, to

' aid 'in, the perfection 1 of the-diaphragm:

The filled and hardenedgintegument, funited- ,asxit isgvvith the slitted member,'con neots and blends, as it Werefthe resonant vibrations produced byand-given Ofi-ir'om said; menu x '1 A die. hragm constructed nthemanner hereins own and described is capable of reat'power' to sustain andiendure the m tiplicity of,

of the'same. If" incorporated in the diaphragm,- the oflice-is one side. of said-member, .adhesive materialcapa' blefofunltlng" tegument"withrsaid ;memberf,and;,of entering, intimately andpermanentlyi int the-texture 75, V of said integument.1f i I I producing inostexcelleut and satisfactory results in volume and .quality of tone.

It is obvious that'modifications,-in addi tiomto those'made special note of ',this specification,- mayfbe made without departin from the spirit of my invention. Vhat, IQ-claim as my inventioi1', and. desireto 'secu reby Letters-Patent, is I I 1. As a new article-of-manufacture, anacousticdiaphragmoomprising a base member slit from a. point outside of the centerthereofigto and through "theedge Of, said member, and an integument afiixed'to's'aid? "member over theslitt'ed portions of'the same.

2; As a new varticle of ,manufacture, an

acoustic diaphragmcomprisinga'baseinem- '60 berperforated-outside of the center thereof ahd having a slit extending from sujch per fof i ration: to and through the edgef ofsaidmem- :-ber,'- and anintegumentl'aifixed ber over the perf o t dian d'slitt'edlportion acoustic":diaphragmlgccmprising a; basememmember, 1 an" integumen her having a plurality Io; periQrationsjthferein adj acentfto thegcenter thereof;fiandjgalso to having a plurality jof: iSlits extending from said perforationslto -a nd. t l ir.ough tlie edge-of, v said member, and an integlunfentigoi ering one sideof vand united with said jm'ember: v.

"JWILLIAMZ W- YOUNG' j Witnesses:

A. C. FAIRBANKS.

momma entera i. 

